test: add make:event broadcast test cases (framework#1532)

[goravel-coder]

Summary

• make:event --broadcast now scaffolds a broadcasting event (implementing BroadcastOn, BroadcastAs, BroadcastWith, and BroadcastWhen), and --broadcast --now additionally scaffolds BroadcastNow returning true; both are covered by new feature tests.
• Broadcast event channels are declared as plain []string instead of the removed contracts.Channel struct.
• Framework bumped to the v1.18.1-0.20260805080351-d2e95f66f306 pseudo-version containing framework#1532 (make:event broadcast/now flags and the broadcasting channel refactor).

Why

Framework PR goravel/framework#1532 adds --broadcast and --broadcast --now flags to the make:event command and replaces the broadcasting.Channel struct with plain []string channels. The example repository must stay in sync with that API so the generated events compile and demonstrate the new scaffolding.

The example's broadcast events now return []string channels, and the event feature suite gains coverage for both new command flags, verifying the scaffolded file contents (broadcast methods present, listener-only methods absent, and BroadcastNow returning true only for the --now variant).

type OrderShippedBroadcast struct {
	OrderData   map[string]any
	ChannelName string
}

func (e *OrderShippedBroadcast) BroadcastOn() []string {
	return []string{
		broadcasting.PublicChannel(e.ChannelName),
	}
}